Japanese grammar question?

Question:

1. what function does the "wa" have in the end of the sentence. natta WA ne..

久しぶり、大きくなったわね。

2. What function does "de" have? is it like... "and..." or "umm....?"

大丈夫です．で、美雨ちゃんは？

3. what's the diff. between　”後”　と　”のち”？

As always, thank you.

Answer:

Wa is a more feminine way of saying "yo," the exclamation particle.

De can mean "and" or it can mean "at," depending on how it is being used.
In this instance it would be like "and."

Nochi is more formal than ato.